fix: revert default max_columns to 20 and update options

Author: shuoweil

bigframes/display/table_widget.js

@@ -116,7 +116,7 @@ function render({ model, el }) {
   maxColumnsLabel.textContent = 'Max columns:';
 
   // 0 represents "All"
-  const maxColumnOptions = [3, 5, 7, 10, 20, 0];
+  const maxColumnOptions = [5, 10, 15, 20, 0];
   for (const cols of maxColumnOptions) {
     const option = document.createElement('option');
     option.value = cols;

tests/js/table_widget.test.js

@@ -414,7 +414,7 @@ describe('TableWidget', () => {
       // Mock basic state
       model.get.mockImplementation((property) => {
         if (property === 'max_columns') {
-          return 7;
+          return 20;
         }
         return null;
       });
@@ -462,7 +462,7 @@ describe('TableWidget', () => {
     it('should update model when value changes', () => {
       model.get.mockImplementation((property) => {
         if (property === 'max_columns') {
-          return 7;
+          return 20;
         }
         return null;
       });
@@ -471,12 +471,12 @@ describe('TableWidget', () => {
 
       const select = el.querySelector('.max-columns select');
 
-      // Change to 20
-      select.value = '20';
+      // Change to 10
+      select.value = '10';
       const event = new Event('change');
       select.dispatchEvent(event);
 
-      expect(model.set).toHaveBeenCalledWith('max_columns', 20);
+      expect(model.set).toHaveBeenCalledWith('max_columns', 10);
       expect(model.save_changes).toHaveBeenCalled();
     });
   });

third_party/bigframes_vendored/pandas/core/config_init.py

@@ -62,9 +62,9 @@ class DisplayOptions:
     """
 
     # Options borrowed from pandas.
-    max_columns: int = 7
+    max_columns: int = 20
     """
-    Maximum number of columns to display. Default 7.
+    Maximum number of columns to display. Default 20.
 
     If `max_columns` is exceeded, switch to truncate view.
     """